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Any effect of dormant spray on companion plants?
"Daniel Hanna" wrote in message home.com.au... In Kirra wrote: It is only used after pruning because it will damage any fresh growth (or any leaves) on the roses. Actually, Kirra, it can be used any time of the year. Even the Yates product instructions say that (I've got a bottle myself!). You just use it at 10 ml per litre of spray instead of 20 ml/L. I've used it on powdery mildew mid season, to great effect. No foliage burning problems, but it did make the foliage smell awful. The side benefit of this was that a rogue possum decided that my roses were now a bit too spicy for its palate. Awww. My blackspot is made of sterner stuff unfortunately. At such low concentrations dormant spray has almost no effect. As it is I spray @ 50% above recommended concentration and I add dormant oil to increase spore killing effects. When I get a really uncontrollable case of B.S. I have been known to nuke the plant with dormant spray to get new leaves. Just did it to a 1 Gallon store rescue Penelope. The tempreture was 92 degrees and in 3 hours all leaves were scorched. Within the week the plant had all new disease free foliage. Powdery mildew I've learnt to ignore. My summers get 100F+ very quickly and the mildew just gets burnt off though I did do battle with a severe case on my Fairy this year. but seriously the smell disuades anything but winter spray. As it is I can still smell last winters spray in certain patches even after remulching. I've even had burns from the cornell formula @ anything above 80F, and this contains as much dormant oil as The spray. Not all roses but frequently enough to give pause. -- Theo in Zone 5 Kansas City Waiting for rain...... |
#17
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Any effect of dormant spray on companion plants?
"Daniel Hanna" wrote in message home.com.au... In Kirra wrote: It is only used after pruning because it will damage any fresh growth (or any leaves) on the roses. Actually, Kirra, it can be used any time of the year. Even the Yates product instructions say that (I've got a bottle myself!). You just use it at 10 ml per litre of spray instead of 20 ml/L. I've used it on powdery mildew mid season, to great effect. No foliage burning problems, but it did make the foliage smell awful. The side benefit of this was that a rogue possum decided that my roses were now a bit too spicy for its palate. Awww. My blackspot is made of sterner stuff unfortunately. At such low concentrations dormant spray has almost no effect. As it is I spray @ 50% above recommended concentration and I add dormant oil to increase spore killing effects. When I get a really uncontrollable case of B.S. I have been known to nuke the plant with dormant spray to get new leaves. Just did it to a 1 Gallon store rescue Penelope. The tempreture was 92 degrees and in 3 hours all leaves were scorched. Within the week the plant had all new disease free foliage. Powdery mildew I've learnt to ignore. My summers get 100F+ very quickly and the mildew just gets burnt off though I did do battle with a severe case on my Fairy this year. but seriously the smell disuades anything but winter spray. As it is I can still smell last winters spray in certain patches even after remulching. I've even had burns from the cornell formula @ anything above 80F, and this contains as much dormant oil as The spray. Not all roses but frequently enough to give pause. -- Theo in Zone 5 Kansas City Waiting for rain...... |
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